在pygame中将矩形保留在屏幕中

import pygame
import sys

pygame.init()

screen_width = 800
screen_height = 600
bg_color = (255, 255, 255)  # 白色背景
screen = pygame.display.set_mode((screen_width, screen_height))
screen.fill(bg_color)

rect_width = 100
rect_height = 50
rect_color = (255, 0, 0)  # 红色矩形
rect = pygame.Rect((screen_width - rect_width) // 2, (screen_height - rect_height) // 2, rect_width, rect_height)

pygame.draw.rect(screen, rect_color, rect)

pygame.display.flip()

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

import pygame
import sys

pygame.init()

screen_width = 800
screen_height = 600
bg_color = (255, 255, 255)  # 白色背景
screen = pygame.display.set_mode((screen_width, screen_height))
screen.fill(bg_color)

rect_width = 100
rect_height = 50
rect_color = (255, 0, 0)  # 红色矩形
rect = pygame.Rect((screen_width - rect_width) // 2, (screen_height - rect_height) // 2, rect_width, rect_height)

pygame.draw.rect(screen, rect_color, rect)
pygame.display.flip()

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()